We have older T-12 lamp and magnetic ballasts in our office. How much energy can we expect to save by switching to T-8 lamps?
A – Often a lot. If you replace your existing T-12 lighting system with T-8 lamps on a 1:1 basis, which includes replacing magnetic ballasts with electronic ballasts, you will reduce the amount of lighting energy by 17-48% depending on the specific lamps and ballasts. In some cases, you can also remove some of the existing T-12 lamps and not replace them. The resulting energy savings in a 2:1 replacement can be as high as 75%, but the resulting light levels will only be about 40-50% of existing conditions. Retrofitting lighting systems in this way is a common way to reduce lighting energy cost. Many energy service companies, lighting contractors and lighting service companies can provide you with an energy audit that will show you the options and make recommendations whether a 50% light level reduction is acceptable. Some utility companies may also offer a rebate or other incentive if you switch.
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